Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      pound         large onion
   1      pound         red bell pepper
   1      pound         green bell pepper
   1      pound         yellow squash
   1      pound         zucchini squash
   1      cup           olive oil
     1/3  cup           Italian seasoning

Preparation:

Peel onions and cut top-to-bottom in large wedges. Cut tops from bell peppers, remove core, and cut in large top-to-bottom pieces. Trim ends from squash and cut in diagonal rounds, about 1/2" thick. Toss all vegetables in a large bowl with olive oil and seasoning, breaking up the onion wedges somewhat. Place in a single layer on a very hot grill (watch out for the flare-ups!) and grill, turning occasionally, until peppers are slightly charred and veggies are tender (about 5 minutes). Serve immediately. These are also good refrigerated, then microwaved to reheat. From: